SVENSK STANDARD SS-EN 10270-2:2011 Fastställd / Approved: 2011-11-07 Publicerad / Published: 2011-11-16 Utgåva / Edition: 2 Språk / Language: engelska / English ICS: 77.140.25; 77.140.65 Fjädertråd Del 2: Oljehärdad fjädertråd Steel wire for mechanical springs Part 2: Oil hardened and tempered spring steel wire
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EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 10270-2 October 2011 ICS 77.140.25 Supersedes EN 10270-2:2001 English Version Steel wire for mechanical springs - Part 2: Oil hardened and tempered spring steel wire Fils en acier pour ressorts mécaniques - Partie 2: Fils en acier trempés à l'huile et revenus Stahldraht für Federn - Teil 2: Ölschlussvergüteter Federstahldraht This European Standard was approved by CEN on 10 September 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A LIS A T I O N EUROPÄIS C HES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10270-2:2011: E
Contents Page Foreword...3 1 Scope...4 2 Normative references...4 3 Terms and definitions...4 4 Classification...5 5 Information to be supplied by the purchaser...5 6 Requirements...6 6.1 Form of delivery...6 6.2 Surface finish...6 6.3 Chemical composition...6 6.4 Non metallic inclusions...6 6.5 Mechanical properties...6 6.6 Technological properties... 12 6.7 Surface quality... 12 6.8 Dimensions and dimensional tolerances... 13 7 Testing and inspection... 14 7.1 Inspection and inspection documents... 14 7.2 Extent of testing for specific inspection... 14 7.3 Sampling... 14 7.4 Test methods... 15 7.5 Retests... 16 8 Marking and packaging... 16 Annex A (informative) Additional information... 18 A.1 Modulus of elasticity and shear modulus at room temperature... 18 2
Foreword This document (EN 10270-2:2011) has been prepared by Technical Committee ECISS/TC 106 Wire rod and wires, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2012, and conflicting national standards shall be withdrawn at the latest by April 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 10270-2:2001. This European Standard for steel wire for mechanical springs is composed of the following parts: Part 1: Patented cold drawn unalloyed spring steel wire; Part 2: Oil hardened and tempered spring steel wire; Part 3: Stainless spring steel wire. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 3
1 Scope 1.1 This European Standard applies to oil hardened and tempered spring steel wire made from unalloyed or alloyed steels. They are primarily subject to torsional stresses such as in coil springs for compression and extension and in special cases also for applications where the spring wire is subject to bending stresses such as lever springs. As a rule unalloyed steels are used for applications at room temperature whereas alloyed steels are generally used at a temperature above room temperature. Alloyed steels may also be chosen for above average tensile strengths. 1.2 In addition to this European Standard, the general technical delivery requirements of EN 10021 are applicable. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10021, General technical delivery conditions for steel products EN 10204:2004, Metallic products Types of inspection documents EN 10218-1:2011, Steel wire and wire products General Part 1: Test methods EN 10218-2, Steel wire and wire products General Part 2: Wire dimensions and tolerances EN 10247, Micrographic examination of the non-metallic inclusion content of steels using standard pictures CEN/TR 10261, Iron and steel Review of available methods of chemical analysis EN ISO 377, Steel and steel products Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997) EN ISO 3887, Steels Determination of depth of decarburization (ISO 3887:2003) EN ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature (ISO 6892-1:2009) EN ISO 14284, Steel and iron Sampling and preparation of samples for the determination of chemical composition (ISO 14284:1996) ISO 7800, Metallic materials Wire Simple torsion test 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 oil hardened and tempered spring steel wire wire that is heat treated in line in the following way: it is first transformed into austenite, quenched in oil or similar quenching medium, followed immediately by tempering by heating to the appropriate temperature 4
4 Classification This standard deals with all types of hardened and tempered spring steel wire. The grade for normal applications made from unalloyed or alloyed steel has the abbreviation FD and is intended for static applications. Spring steel wire for medium fatigue levels, such as required for some clutch springs from unalloyed or alloyed steel, has the abbreviation TD. Spring steel wire from unalloyed steel or alloyed steel intended for use under severe dynamic duty such as for valve springs or other springs with similar requirements has the abbreviation VD. The diameter ranges for the various wire grades are shown in Table 1. Table 1 Spring wire grades and diameter range Tensile strength Static Medium fatigue High fatique Low tensile strength FDC TDC VDC Medium tensile strength FDCrV TDCrV VDCrV High tensile strength FDSiCr TDSiCr VDSiCr Very high tensile strength FDSiCrV TDSiCrV VDSiCrV Diameter range (mm) 0,50 to 17,00 0,50 to 10,00 0,50 to 10,00 Medium and high fatigue grades TD and VD are characterized by high steel cleanliness, specific chemical, mechanical and technological parameters and a well defined surface condition in relation to the allowable depth of surface defects and decarburization. The static grade FD is characterized by its chemical, mechanical and technological characteristics as well as by a specified surface condition concerning surface defects and decarburization. 5 Information to be supplied by the purchaser The purchaser shall clearly state in his enquiry or order the product and following information: a) the desired quantity; b) the term spring steel wire or straightened and cut lengths; c) the number of this European standard: EN 10270-2; d) the steel grade (see Tables 1 and 2); e) the nominal wire diameter selected from Tables 4 or 5 and for cut length the length and the length tolerance class (see Table 9); f) the form of delivery and unit mass (see 6.1); g) the type of inspection document; h) any particular agreement. EXAMPLE 5 t oil hardened and tempered spring steel wire according to this standard, grade VDC, nominal diameter 2,50 mm in coils of about 300 kg; inspection document 3.1 according to EN 10204:2004: 5
5 t spring steel wire EN 10270-2 VDC-2,50 in coils of about 300 kg; EN 10204:2004 3.1 6 Requirements 6.1 Form of delivery 6.1.1 Oil hardened and tempered wire shall be supplied in coils, on spools or in cut lengths. The wire in coils or on spools shall form one continuous length. Wire in coil may also be supplied on carriers containing one or more coils. For "VD" and "TD" grades no welds are permitted after the heat treatments preceding the final drawing operation; for "FD" grades no welds shall be made at finished size unless agreed otherwise between the parties. 6.1.2 The supplied wire units shall be tightly bound to ensure that wire spiral waps do not spring out unexpectedly. The starting end shall be marked and at the coil ends the wire shall be covered with a protective cap. 6.2 Surface finish The wire shall be protected against corrosion and mechanical damage. Unless otherwise specified the wire shall be delivered in slightly oiled condition. 6.3 Chemical composition The steel is characterized by the heat analysis which shall be in accordance with the values of Table 2. The permissible deviation of the product analysis from the limiting values of heat analysis shall be in accordance with Table 3. 6.4 Non metallic inclusions The "VD" grades shall be checked for maximum size of inclusion according to EN 10247. The allowable level of inclusions shall be agreed between the parties at the enquiry and order. 6.5 Mechanical properties For tensile strength R m and reduction in area after fracture (Z) the wire grades shall satisfy the values listed in Tables 4 and 5. Reduction of area is measured only for size 1,00 mm and above (see Tables 4, 5 and 11). The range of the tensile strength values within a coil/reel shall not exceed 50 MPa for the grades "VD", 60 MPa for the grades "TD" and 70 MPa for the grades "FD". 6
Table 2 Chemical composition, % by mass Grade C Si Mn a P S Cu Cr V max. max. max. VDC 0,60 to 0,75 0,15 to 0,30 0,50 to 1,00 0,020 0,020 0,06 - b - VDCrV 0,62 to 0,72 0,15 to 0,30 0,50 to 0,90 0,025 0,020 0,06 0,40 to 0,60 0,15 to 0,25 VDSiCr 0,50 to 0,60 1,20 to 1,60 0,50 to 0,90 0,025 0,020 0,06 0,50 to 0,80 - VDSiCrV 0,50 to 0,70 1,20 to 1,65 0,40 to 0,90 0,020 0,020 0,06 0,50 to 1,00 0,10 to 0,25 C TDC 0,60 to 0,75 0,10 to 0,35 0,50 to 1,20 0,020 0,020 0,10 - b - TDCrV 0,62 to 0,72 0,15 to 0,30 0,50 to 0,90 0,025 0,020 0,10 0,40 to 0,60 0,15 to 0,25 TDSiCr 0,50 to 0,60 1,20 to 1,60 0,50 to 0,90 0,025 0,020 0,10 0,50 to 0,80 - TDSiCrV 0,50 to 0,70 1,20 to 1,65 0,40 to 0,90 0,020 0,020 0,10 0,50 to 1,00 0,10 to 0,25 C FDC 0,60 to 0,75 0,10 to 0,35 0,50 to 1,20 0,030 0,025 0,12 - b - FDCrV 0,62 to 0,72 0,15 to 0,30 0,50 to 0,90 0,030 0,025 0,12 0,40 to 0,60 0,15 to 0,25 FDSiCr 0,50 to 0,60 1,20 to 1,60 0,50 to 0,90 0,030 0,025 0,12 0,50 to 0,80 - FDSiCrV 0,50 to 0,70 1,20 to 1,65 0,40 to 0,90 0,030 0,025 0,12 0,50 to 1,00 0,10 to 0,25 a b C Manganese may be ordered with restricted range, but with a minimum range of 0,20 %. For heavy wire diameter (above 8,5 mm) chromium may be added up to 0,30 % for proper through hardening. For medium and high fatigue grades the range of vanadium content can be limited to 0,05 % to 0,15 % Table 3 Permissible deviation of the product analysis from the limiting values for the heat analysis Chemical element Wire grade Permissible deviation % by mass C All ± 0,03 Si SiCr, SiCrV ± 0,05 other grades ± 0,03 Mn All ± 0,04 P All + 0,005 S All + 0,005 Cu All + 0,02 Cr All ± 0,05 V All ± 0,02 7